The patterns of advective development are classified for twelve synoptic sequences in the Polar Basin during the June through October interval of 1979. The intent is to develop models of the advective contribution to synoptic evolution.
Fifteen categories are derived from 94 cases. Five are significant classes in that they represent at least 6 members each. While there is a predominance of patterns which are interpreted as weakening or occuluded, there are significant examples of intensification and frontogenesis within the Basin. One case is over the central Arctic Ocean. In other classes, there is development as a result of radiative or diabatic influences despite the frontolyic nature of the advective patterns.
This is the first attempt to classify synoptic systems on the basis of a dynamic index, in contrast to pressure patterns. This approach provides new insight into the processes responsible for the evolution of the systems.
KeywordsEnvironmental Management Arctic Ocean Significant Classis Pressure Pattern Dynamic Index
List of symbols
specific heat of dry air
acceleration due to gravity
diabatic heating rate
geostrophic wind velocity
approximate vertical velocity — omega
density of air
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